Bug 858524 - Rename nsBarProp to BarProp, r=ms2ger

--HG--
rename : dom/base/nsBarProps.cpp => dom/base/BarProps.cpp
rename : dom/base/nsBarProps.h => dom/base/BarProps.h
Bug 858524 - Move BarProp objects to Paris bindings, r=ms2ger, r=smaug